electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
551. The overall efficiency of a steam power station is ________ its thermal efficiency.
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A. equal to

B. greater than

C. none of the above

D. less than
552. For forced draught system, the function of chimney is mainly_____________?
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A. none of the above

B. to reduce the temperature of the hot gases discharged

C. to produce draught to accelerate the combustion of fuel

D. to discharge gases high up in the atmosphere to avoid hazard
553. For transmission of power over a distance of 200 km, the transmission voltage should be_________kv?
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A. 11 kV

B. 33 kV

C. 66 kV

D. 132 kV
554. The efficiency of two identical transformers under load conditions can be determined by_______________?
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A. short-circuit test

B. any of the above

C. back-to-back test

D. open circuit test

555. The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is__________?
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A. 0.5457

B. 0.6

C. 0.555

D. 0.578

556. Load curve is useful in deciding the__________?
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A. sizes of generating units

B. all of the above

C. A. operating schedule of generating units

D. total installed capacity of the plant

557. Regenerative cycle thermal efficiency_______________?
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A. is always less than simple Rankine cycle thermal efficiency

B. is always greater than simple Rankine thermal efficiency

C. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure

D. is same as simple Rankine cycle thermal efficiency

558. Compounding of steam turbine is done for_______________?
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A. reducing the rotor speed

B. reducing the work done

C. balancing the turbine

D. increasing the rotor speed

559. The efficiency of chimney is approximately______________?
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A. 0.25%

B. 80%

C. 20%

D. 40%

560. Reheat factor is the ratio of_____________?
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A. cumulative actual enthalpy drop for the stages to total is isentropic enthalpy heat drop

B. isentropic heat drop to useful heat drop

C. adiabatic heat drop to isentropic heat drop

561. For given applied voltage, with the increase in frequency of the applied voltage?
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A. none of the above

B. eddy current loss will decrease

C. eddy current loss will increase

D. eddy current loss will remain unchanged
562. The secondary winding of which of the following transformers is always kept closed?
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A. Current transformer

B. Step-down transformer

C. Potential transformer

D. Step-up transformer

563. In steam turbines the reheat factor_____________?
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A. decreases with the increase in number of stages

B. remains same irrespective of number of stages

C. increases with the increase in number of stages

D. none of the above

564. N atural air coo ling is generally restricted for transformers up to__________?
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A. 5 MVA

B. 1.5 MVA

C. 15 MVA

D. 50 MVA

565. In a shell and tube surface condenser____________?
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A. cooling water passes through the tubes and steam surrounds them

B. steam passes through the cooling tubes and cooling water surrounds them

C. steam and cooling water mix to give the condensate

D. all of the above varying with situation

566. Incase of reaction steam turbine___________?
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A. there is enthalpy drop both in fixed and moving blades

B. there is enthalpy drop only in fixed blades

C. there is enthalpy drop only in moving blades

D. none of the above

567. Which of the following is usually not the generating voltage ?
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A. 13.2 kV

B. 8.8 kV

C. 6.6 kV

D. 11 kV

568. TravelUng grate stoker can burn coals at the rates of____________?
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A. 75100 kg/m per hour

B. 5075 kg/m per hour

C. 100150 kg/m per hour

D. 150200 kg/m2 per hour
569. On which of the following factors skin effect depends?
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A. Size of the conductor

B. Resistivity of the conductor material

C. All of the above

D. Frequency of the current

570. The spacing between phase conductors of a 220 kV line is approximately equal to________________?
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A. 8.5 m

B. 6 m

C. 3.5 m

D. 2 m

571. The voltage of the single phase supply to residential consumers is_____________?
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A. 110 V

B. 210 V

C. 400 V

D. 230 V
572. The overall efficiency of thermal power plant is equal to____________?
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A. Rankine cycle efficiency

B. Boiler efficiency x turbine efficiency x generator efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency
573. Annual operating expenditure of a power plant consists of_________?
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A. fixed charges

B. semi-fixed charges

C. running charges

D. all of the above
574. The percentage O2 by Weight in atmospheric air is____________?
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A. 77%

B. 79%

C. 18%

D. 23%
575. In a boiler installation the natural draught is produced_____________?
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A. due to the fact that at the chimney top the pressure is more than its environmental pressure

B. due to the fact that furnace gases being light go through the chimney giving place to cold air from outside to rush in

C. all of the above

D. due to the fact that pressure at the grate due to cold column is higher than the pressure at the chimney base due to hot column
576. When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?
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A. Current will flow to earth

B. None of the above

C. Supply voltage will drop

D. No current will flow in the conductor

E. Supply voltage will increase

577. In a steam power plant, the function of a condenser is__________?
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A. to receive large volumes of steam exhausted from steam prime mover

B. to maintain pressure below atmospheric to increase work output from the primemover

C. all of the above

D. to condense large volumes of steam to water which may be used again in boiler

578. A transformer can have regulation closer to zero___________?
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A. on full-load

B. on overload

C. on zero power factor

D. on leading power factor
579. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
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A. 150 kgf/cm2

B. 50 kgf/cm2

C. 100 kgf/cm2

D. 20 kgf/cm2

580. The angular displacement between two interconnected stations is mainly due to___________?
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A. armature reactance of both alternators

B. reactance of the interconnector

C. synchronous reactance of both the alternators

D. all of the above

581. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?
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A. none of the above

B. decreases with number of feed heaters increasing

C. increases with number of feed heaters increasing

D. remains same unaffected by number of feed heaters

582. The efficiencies of transformers compared with that of electric motors of the same power are____________?
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A. somewhat smaller

B. about the same

C. much higher

D. much smaller

E. none of the above

583. The pressure at the furnace is minimum in case of___________?
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A. induced draught system

B. natural draught system

C. balanced draught system

D. forced draught system

584. The size of a transformer core will depend on__________?
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A. A. and B. both

B. area of the core

C. frequency

D. flux density of the core material

585. Carnot cycle comprises of_______?
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A. two isentropic processes and two constant volume processes

B. two isothermal processes and three constant pressure processes

C. none of the above

D. two isentropic processes and two constant pressure processes
586. The transformer oil should have _______ volatility and _______ viscosity?
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A. low,low

B. high,low

C. high,high

D. low,high

587. Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________?
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A. 50 percent

B. 25 percent

C. 75 percent

D. 100 percent

588. Which of the following power plant has least fuel transportation______________?
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A. diesel generating plants

B. steam power stations

C. thermal power plants

D. nuclear power plants
589. Overhead system can be designed for operation up to____________?
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A. 33 kV

B. 400 kV

C. 66 kV

D. 11 kV

590. A steam power stations basically work on the______________?
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A. Vapor pressure cycle

B. Carton cycle

C. Rankin cycle

D. thermodynamic cycle

591. The loads on distributors systems are generally__________________?
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A. either of the above

B. none of the above

C. unbalanced

D. balanced

592. In fuel cell, the ___________ energy is converted into electrical energy?
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A. mechanical

B. chemical

C. heat

D. sound

593. In De Laval steam turbine___________?
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A. none from the above

B. the pressure in the turbine rotor is higher than pressure in the condenser

C. the pressure in the turbine rotor is approximately same as in condenser

D. the pressure in the turbine rotor gradually decreases from inlet to exit from condenser

594. Steam turbines are governed by the following methods_____________?
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A. Throttle governing

B. Nozzle control governing

C. all of the above

D. By-pass governing

595. In a tap changing transformer, the tappings are provided on__________?
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A. secondary winding

B. any of the above

C. high voltage winding

D. primary winding

596. Overhead lines generally use__________________?
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A. all aluminium conductors

B. A.C.S.R. conductors

C. none of these

D. copper conductors

597. Parsons turbine is___________?
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A. simple single wheel reaction steam turbine

B. pressure compounded steam turbine

C. simple single wheel, impulse steam turbine

D. multi wheel reaction steam turbine
598. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?
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A. 0.578

B. 0.6

C. 0.555

D. 0.5457

599. The value of reheat factor normally varies from___________?
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A. 1.02 to 1.06

B. 0.9 to 0.95

C. 1.2 to 1.6

D. 0.5 to 0.6

600. For the safety of a steam boiler the number of safety valves fitted are____________?
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A. four

B. three

C. one

D. two